Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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The Effect of the Deformation on the Sensitivity of a Flexible PDMS Membrane Sensor to Measure the Impact Force of a Water Droplet

액적의 충격력 측정을 위한 유연 멤브레인 센서의 PDMS 변형에 의한 민감도의 영향

  • Kang, Dong Kwan (Division of Mechanical, Automotive and Robot Component Engineering, Dong-Eui University) ;
  • Lee, Sangmin (Division of Mechanical, Automotive and Robot Component Engineering, Dong-Eui University)
  • 강동관 (동의대학교 기계자동차로봇부품공학부) ;
  • 이상민 (동의대학교 기계자동차로봇부품공학부)
  • Received : 2022.01.04
  • Accepted : 2022.03.14
  • Published : 2022.05.31
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Abstract

This study investigates the effect of the deformation on the sensitivity of a flexible polydimethylsiloxane (PDMS) membrane sensor. A PDMS membrane sensor was developed to measure the impact force of a water droplet using a silver nanowire (AgNW). The initial deformation of the membrane was confirmed with the application of a tensile force (i.e., tension) and fixing force (i.e., compressive force) at the gripers, which affects the sensitivity. The experimental results show that as the tension applied to the membrane increased, the sensitivity of the sensor decreased. The initial electrical resistance increased as the fixing force increased, while the sensitivity of the sensor decreased as the initial resistance increased. The movement of the membrane due to the impact force of the water droplet was observed with a high-speed camera, and was correlated with the measured sensor signal. The analysis of the motion of the membrane and droplets after collision confirmed the periodic movement of not only the membrane but also the change in the height of the droplet.

Keywords

Acknowledgement

This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. NRF-2020R1F1A1050735).

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